Preferred label

Spiral lock       

Alternative label

Self-stabbing spiral lock; Butterfly lock; Recursive perforation lock        

Scope note

A high-security, narrow lock-SA that repeatedly passes through slits in the letterpacket, and, usually, itself in a series of circular movements. 

Parent concept       

Lock        

uh-linked-data/concept/309 

Related concept           

Distinctive letterlocking style        

uh-linked-data/concept/104

The Arts & Architecture ThesaurusⓇ Online, The Getty Research Institute. Concept uri

Not in AAT

The Language of Bindings Thesaurus (LoB) Concept uri

Not in LoB

Scope note source reference

Source

Jana Dambrogio, Daniel Starza Smith, and the Unlocking History Research Group. Letterlocking, The Hidden History of the Letter. Cambridge and London: MIT Press, 2025.

Unlocking History Concept uri

uh-linked-data/concept/504